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BA’s Oneworld partner Finnair is currently offering some excellent Business Class fares from London Heathrow to Bangkok – starting at just £1128:
Availability looks pretty good from the end of January through to mid June 2022. As usual, Google Flights is your best bet for seeing a wide range of dates quickly and easily.
You can save about £20 by booking through an Online Travel Agency, but I’d strongly recommend paying the extra to book direct with Finnair.
Note that these are ‘Business Light’ fares, so they don’t include checked luggage or lounge access.
These are very good fares for a decent Business Class product from London to Bangkok. If you credited the flights to British Airways Executive Club, you would earn about 15,000 Avios and 440 Tier Points.